The system includes one self-contained smoke detector of the ionization type with:
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a measuring chamber through which the air to be analyzed flows,
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a reference resistor.
Smoke Detector - Description
Figure 006A
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Smoke Detector-Operation
Figure 007
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Smoke Detector - Schematic
Figure 008
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B. Indicating
When the smoke concentration in the measuring chamber is above the reference threshold, the inner electronic circuit triggers the smoke warnings to the cockpit: (Ref. Fig. 009) - on the EMER ELEC PWR section of the panel 21VU
. the SMOKE legend of the GEN 1 LINE pushbutton switch comes on,
- on the VENTILATION section of the OVERHEAD CTL & IND panel 22VU . the FAULT legends of the BLOWER and EXTRACT pusbutton switches come on,
-the MASTER CAUT light comes on,
-a warning message is shwon on the lower ECAM display unit.
The single chime (SC) sounds.
NOTE : When smoke concentration decreases below the alarm threshold, the
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smoke detector returns to the initial state.
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Smoke Detector - Schematic
Figure 008A
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Avionics-Compartment Smoke-Detection System - Indicating and Test
Figure 009
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C. Control
(1) Smoke Procedure
(Ref. Fig. 010)
The list of the necessary actions during the smoke procedure comes into view automatically on the lower ECAM display unit while the SMOKE warnings are triggered.
When these actions are completed, the related lines are cancelled automatically on the lower ECAM display unit (See ATA Ref. 31-51-00).
The procedure below must be applied:
(Ref. Fig. 010)
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Avionics-Compartment Smoke-Detection System - Indicating and Test
Figure 009A
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Avionics-Compartment Smoke-Extraction System - Schematic
Figure 010
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-------------------------------------------------------------------------------DISPLAY ACTIONS -------------------------------------------------------------------------------
AVIONICS SMOKE LAND ASAP
. IF PERCEPTIBLE SMOKE :
. Smoke from avionics compartment is
detected directly by the crew.
-OXY MASK/GOGGLES........ON
. Make sure crew members can speak to control tower each other. Do not use the interphone position to keep the interference of the oxygen-mask breathing noise to a minimum.
-CAB FANS...............OFF
. To keep smoke off the cockpit and the cabin.
-BLOWER................OVRD
-EXTRACT...............OVRD
. Avionics ventilation is provided by air conditioning system and extracted overboard: Valve F opening, valve B partial opening, valves A, E and D closing. Blower fan (A) stopping, extract fan (B) remains energized.
. IF SMOKE AFTER 5MN00S:
. An electrical procedure is applied to eliminate the cause of the smoke if the smoke emission persists more than 5 mn.
-EMERG ELEC GEN 1 LINE..OFF
. GEN 1 LINE contactor opens. GEN 1 remains in operation and supplies one fuel pump in each wing tank. AC BUS 1 is supplied by GEN 2 through bus tie contactor.
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